[Shadow Orb Power] buff... What is it and where does it come from?

I don't understand what it is and most importantly - where is it coming from... I'm very sorry if this is something obvious, but please explain because I'm confused. I've examined every talent and spell, but cannot find anything.

When shadow orbs are consumed, you also gain a buff to ure periodic damage.
Even though I cant say this 100% sure, I think its so it would be more tempting now going for dots after a shadow orb consuming.
It allways come after u consume shadow orbs, if it dont show its a bug, ticket blizz

The shadow orbs orbiting around your character ( up to a maximum of 3 ) are gained from casting shadow spells if I'm not wrong. These orbs give a boost in damage to your next mind blast. After the orbs are "consumed" for the mindblast, you gain a buff that gives you 10%(?) periodic shadow dmg buff. This 10% dot buff is a red orb icon.

Shadow orbs will increase the damage done by Mind Blast when consumed, when consumed they will also buff you with Empowered Shadows which increases periodic damage by 10% and lasts 14secs, you should maintain this buff if possible for the entire fight. Every time you cast MB with an orb, it will be refreshed. Avoid casting MB without having an orb up.

I would not wait for 3 orbs up for MB, if they are, bonus, but its a DPS loss to wait for 3 due to the RNG

The shadow orbs orbiting around your character ( up to a maximum of 3 ) are gained from casting shadow spells if I'm not wrong. These orbs give a boost in damage to your next mind blast. After the orbs are "consumed" for the mindblast, you gain a buff that gives you 10%(?) periodic shadow dmg buff. This 10% dot buff is a red orb icon.

Shadow orbs will increase the damage done by Mind Blast when consumed, when consumed they will also buff you with Empowered Shadows which increases periodic damage by 10% and lasts 14secs, you should maintain this buff if possible for the entire fight. Every time you cast MB with an orb, it will be refreshed. Avoid casting MB without having an orb up.

I would not wait for 3 orbs up for MB, if they are, bonus, but its a DPS loss to wait for 3 due to the RNG

Now I understand. But still, why is there no in-game info regarding this Red Orb buff? I mean, if I had no forum access, how would I ever figure out that it comes from consuming Shadow Orbs? :-(